时空尺度对洪水模拟的影响研究

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1、河海大学博士学位论文时空尺度对洪水模拟的影响研究姓名：魏林宏申请学位级别：博士专业：水文学及水资源指导教师：郝振纯20041116AbstractAconceptdistubutedhydrologicmodelisbuiltinthedissertation，basedoilwhichtheeffectofDEMresolutionandspatialtemporaldistributionofrainfallonrunoffsimulationisdiscussedinthreesub—basin：Jiang

2、ji，HuangnizhuangandQilinofShiguanriverbasin．Theobjectofspatialanalysisistodistlactandtransportthespatialinformation．AnalyzinghydrologicdataandDEMdataisthefoundationofapplicationofdistributedhydrologicmodel．ThispaperdealswithhydrologicdataandDEMdatausingdiffer

3、entinterpolationandaggregationmethodsTheresultsshowthatCressmariobjectanalysismethodisthebes；aggregationmethodofallselectedaggregationmethodsTrendmethodisthebestinterpolationmethodforDEMAccuracyofaggregationandinterpolationforDEMisrelatedwithcomplexityofterra

4、inThemorecomplexoftheterrainis，thelargerdeviationis．thebestinterpolationmethodsforrmnfNlisKdgingmethodsHowevegkrigingmethods&renoadvantageforrainfallinterpolationwhenthedensityofrmnstatennetworkisverylow．ThemethodthatcombinesDgmethodwithdigitizingthemainriver

5、ways，lakeandreservoir(DMRLN)isusedtoextractrivernetworkfonnDEMTherivernetworkextractedwiththismethodreproducestheskeletonoftruerivernetworkTheconce：叶distributedmodelbasedDEMisprovedreasonablebycalibmionandvalidationofthemodel．Withtheincreasingapplicationofdis

6、tzibutcdhydsologioalmodelbasedonDEMtheaccuracyandresolutionofDEMsispaidmoreaaention．TopographtyparametersandhydrologicalparomaersextractedfromDEMsfleeanalyzedw}lenDEMresolutieaisvaried．ThehffonnationcontentofdifferentresolutionDEMisquantifiedusingentropyandan

7、alysisthesensitivityofhydmlogicalparametersextractedfromDEMtoDEMentropy．BasedontheseanalysestheeffectofdifferentDEMresolutionontherunoffsimulationandhydrologicparameterisanalysisRainPallisOFIeofthelargestuncertainfactorsAtthesalrtetlmeitisthemostimportantinfo

8、rmationforfloodforecaatingTherainstationnetworksuppliestherainfalldataforhydrologicanalysisandsimulation．However,ralngagerainfalldataacquiredlbrmpointobservationscabnotcatchthedistributin